Unitarity and normalization of string amplitudes

Cristofano, Gerardo; Marotta, Raffaele; Roland, Kaj

doi:10.1016/0550-3213(93)90676-G

Unitarity and normalization of string amplitudes

Gerardo Cristofano
(
- Naples U. and
- INFN, Naples
)
,
Raffaele Marotta
(
- Naples U. and
- INFN, Naples
)
,
Kaj Roland
(
- Sissa, Trieste and
- INFN, Trieste
)

Jun, 1992

25 pages

Published in:

Nucl.Phys.B 392 (1993) 345-368

DOI:

10.1016/0550-3213(93)90676-G

Report number:

SISSA-94-92-EP,
DSF-T-NA-92-13

View in:

AMS MathSciNet

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Abstract: (Elsevier)

The normalization of string amplitudes is fixed at arbitrary genus by the requirement that the elastic two-particle scattering amplitude exponentiates in the Regge regime. We use this approach to determine the overall normalization of the N -string g -loop vertex in three cases: for the bosonic string; for the type II superstring in the Neveu-Schwarz sector; and for a heterotic string model in the sector containing Yang-Mills interactions. We present a regularization procedure that removes the tachyonic contribution from the bosonic string calculation.

string model: heterotic
supersymmetry: superfield
scattering amplitude: higher-order
higher-order: scattering amplitude
partition function
vertex function
boson: string model
field theory: tachyon
postulated particle: graviton
analytic properties

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